Efficiency of ultrafiltration purification of solutions of polym

Details Efficiency of ultrafiltration purification of solutions of polym Efficiency of ultrafiltration purification of solutions of polym

1976-11-18

1980-09-30

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252447, 210639, 260152, 260157, 260208, 260556A, 260561N, 260583H, 260583P, 260704, 546 76, B01D 3100, C02F 144, C09B 6700

Patent

active

042254329

ABSTRACT:
The ultrafiltration purification of aqueous solutions of polymeric colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified polymeric colorant-bearing retentate, is carried out with improved efficiency when during at least 2 diavolumes of ultrafiltration, the pH of the retentate is maintained above about pH 9.0.

REFERENCES:
patent: 2065928 (1936-12-01), Waldron
patent: 2124590 (1938-07-01), Reed
patent: 2611771 (1952-09-01), Marnon
patent: 3526588 (1970-09-01), Michaels et al.
patent: 3679661 (1972-07-01), Babson
patent: 3920855 (1975-11-01), Dawson et al.
patent: 4088572 (1978-05-01), Cooper et al.
Perry, "Progress in Separation and Purification", vol. 1, pp. 297 to 334 (1968).
Weissberger (II), Technique of Organic Chemistry., vol. III, pp. 558 to 563, 565 (1950).

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